VEVOR 4.5 CFM 1/3 HP Single-Stage Vacuum Pump, 110V

Description

4.5 CFM Single-Stage Vacuum Pump

This is a bare 4.5 CFM, 1/3 HP single-stage rotary vane pump with a 5 Pa ultimate-vacuum rating and a 1/4 in. inlet. It is compact enough for mobile AC work and priced as a pump only, so you can reuse an existing manifold gauge and hose set.

What is in the box: Vacuum pump only. Gauges, hoses and vacuum oil are not shown in the package image.

What 4.5 CFM and a single-stage design mean

Free air displacement tells you how much air the pump can move at its inlet under flow conditions. It is not the same as the flow rate once the system is near deep vacuum. A higher CFM pump tends to shorten the time needed to remove the initial volume of air, while the final micron reading depends on the pump’s ultimate vacuum, the condition of its oil, the hoses, the manifold seals and the leak tightness of the system.

This pump is a tool-only option. If you do not already own a manifold gauge, service hoses, a micron gauge and vacuum oil, the total setup cost and the number of separate parts will be higher than a kit. The 1/4 in. inlet is convenient, but smaller hoses and fittings can restrict flow, so use short, sealed service lines and remove Schrader-core restrictions where the procedure allows.

Fittings and service setup

The listed intake fittings are 1/4 in. inlet. Check the thread and flare style against your manifold before connecting a hose. Use short, pressure-rated service hoses, replace damaged gaskets and keep the hose ends capped when they are not in use. A small air leak or a worn Schrader-core tool can make a good pump look weak because the micron reading never settles.

Where this pump fits

Use it for passenger-car AC, small refrigeration units and occasional workshop jobs. Its smaller body makes it easier to carry than the 12 CFM model. For a large system, a very long hose run or a job that needs the deepest stable vacuum, a two-stage pump with a larger displacement is a better match.

• Evacuation: pull down with the service valves arranged according to the equipment procedure, then let the pump run long enough for moisture to leave the system.
• Leak check: isolate the pump and watch the vacuum hold. A rising gauge points to a leak or outgassing, not a reason to add refrigerant.
• Oil check: keep oil between the sight-glass marks and replace it when it looks cloudy, dark or contaminated.
• Heat: use the cooling fan and give the pump a sensible duty cycle; a hot body is a warning to stop and inspect.

Choosing this pump

Choose this if your manifold and hoses are already sorted and you want a simple, compact pump. Choose the 3 CFM case kit if you need everything in one box; choose a 5 to 7 CFM two-stage pump if you need deeper vacuum or faster evacuation on larger systems.

Before the first job

Confirm the supply voltage, set the pump on a level surface and check that the exhaust is not blocked. Fill the oil to the correct mark, close the inlet valve, and run a short no-load check while watching for unusual noise or oil movement. For refrigerant work, follow the equipment maker’s evacuation target, use a micron gauge, and never use vacuum alone as proof that a system is leak-free.

Wholesale pricing

One unit, wholesale pricing. The listed price is the wholesale rate for one pump. There is no minimum order quantity and no separate tier price, so buying one unit and buying several units use the same listed unit price.

Performance & Applications